Typewriting machine



Dec. 25, 1928.

E. E. BARNEY TYPEWRITING MACHINE Filed Dec. 51, 1 926 2 Sheets-Sheet I lI l Q ug 6m 5 INVENTOR E, D

ATTORNEY WITNESSES Patented Dec. 25, 1928.

UNITED STATES PATENT OFFICE EDWIN E. BARNEY, OF NEV ROCHELLE, NEW YORK,ASSIGNOR TO REMINGTON TYPE- WRITER COMPANY, OF ILION, NEW YORK, ACORPORATION OF NEW YORK.

TYPEWRITING MACHINE.

Application filed December 31, 1926.

My invention relates to escapement mechanism for typewriting machinesand its object generally stated is to provide new and improvedescapement mechanism which. shall insure regularity in step-by-stepfeeding movements of the carriage under all conditions arising duringthe operation of the machine. More specifically my present-inventiondiscloses an adaptation of the'main principles first embodied in theform of carriage feeding or cscapement mechanism disclosed in my priorPatent No. 1,603,109, granted Oct. 12, 1926.

To the above and other ends which will hereinafter appear my presentinvention consists in the features of construction, combinations ofdevices and arrangements of parts hereinafter described and particularlypointed out in the claims.

The preferred form of my invention is illustrated in the accompanyingdrawings, wherein Fig. 1 is a fragmentary front-to-rear verticalsectional View in skeletonized form il lustrating my escapementmechanism applied to a No. 12 Remington typewriting machine.

Figs. 2, 3, and 4 are operating views, certain of the escapement devicesbeing shown in vertical section.

Figs. 5 and 5 are horizontal sectional views, Fig. 5 being taken on aplane indicated by the section line 1-1 in Fig. 2 and looking downwardin the direction of the arrow at said line, and Fig. 5 a correspondingview showing the normal relationship of the parts.

Figs. 6 and 6 are horizontal sectional views, Fig. 6 being taken on aplane indicated by the section line 22 of 3 and looking downward in thedirection of the arrow at said line, and Fig. 6 a corresponding viewshowing the normal relationship of the parts.

Fig. 7 is a rear elevation partly in section on an enlarged scaleshowing the escapement mechanism proper; and

Fig. 8 is a vertical sectional view taken on planes indicated by thesection line 3-3 in Fig 7.

H retofore carriages controlled byescapement mechanisms have beenfrequently subject to irregularity in feeding or spacing, due primarilyto rapid or irregular operation of the keys. Frequently an impulseSerial No. 158,286.

from the space bar is transmitted to the escapement mechanism before thecompletion oi a prioroperation thereof under actuation of a printingkey, as a consequence of which the next following imprint takes place immediately adjacent to the preceding imprint and without leaving a spacebetween the two imprints asv was intended. Such eseapement mechanismsare usually set or adjusted so as to release the carriage as soon aspossible after the printing of a character, the result being that thereis a narrow zone or field in which the type bar moves away from theplaten prior to the escapement movement of the carriage. Sometimes,while the type bar is still in this zone the space bar is actuated,resulting in a defective operation, such as above referred to. Mypresent in vention is designed to cure such defective operations and incarrying it out I provide as in my prior patented construction above referred to, a duplex escapement comprising two complete escapementmechanisms, one operative by the printing keys only and the other by thespace-key or bar alone. The first of these escapement mechanismscomprises two escapement wheels coaxially mounted and relatively movableto an extent somewhat less than a letter space distant, said wheelsbeing operatively combined with a single dog. Said dog is of an unusualconstruction, being in the form of a toothed wheel provided. with tenteeth, said wheel being rigidly connected to another or second toothedwheel-which is one of the elements of the other escapement mechanism.The two toothed wheels are mounted on a vibratory support or dog rockerwhich is operative from the curved universal bar of the Remingtonmachine, said universal bar receiving its impulses from the type bars under actuation of the printin keys. Cooperative with the second ofthetoothed wheels is an escapement dog mechanism of ordinary mechanismwill. remain substantially unaffected during vibrations or actuations ofthe first rocker under impulses of the printing keys. The constructionis such that both escapement mechanisms will operate to af ford a letterspace movement of the carriage no matter how they may be actuated. Forexample, if the second escapement is operated before the completion ofan operation of the first cscapement the result will be the same asthough the two escapement mechanisms were duly operated one after theother.

Referring now specifically to the present embodiment of my invention,the Remington typewriting machine to which said invention is shown asapplied has a main frame comprising a base portion 1 and a top plate 2,as shown fragmentarily in Fig. 1. Mounted above the top plate is a.powerdriven platen carriage comprising a rectangular truck 3, saidcarriage supporting a platen 4 (diagrammatically shown) and supportedthrough anti-friction rollers 5 on front and rear guide rails fixed tothe top plate, only the rear guide rail 6 being shown. Type bars 7cooperate with the front face of the platen, said type bars beingpivoted at 8 on a segment 9 and normally resting at their free endsagainsta type rest- 10. The heel portion of each type bar is formed witha slot 11 which is engaged by an actuating pin 12 that projectslaterally from the upper end portion of a sub-lever 13, the set ofsub-levers being pivoted at let on a stationary support 15. The shortarm of each sub-lever is formed with a slot 16 which is, engaged by alate "al pin 17 projecting from an upward extension or arm of a keylever 18. The set of key levers are pivoted at their rear ends on afulcrum plate 19 and at their front ends are provided with key caps 20.Then any key 20 is depressed it operates through the described train ofconnections to actuate the connected type bar, swinging it upward andrearward on its pivot into printing contact with the front face of theplaten 4.

Each type bar has a contact face 21 which, as the companion type headnears the platen, strikes against the front of a curved universal bar 22received in a depression 23 that is formed in the rear face of the typebar segment 9. The universal bar proper 22 is part of a frame whichfurther comprises rearwa-rdly extending arms 24. A lug 25 on said framecarries a guide pin 26 which slidably engages in a hole 2'7 in thesegment 9, thus assisting to support and guide the front portion of saidframe. The rear portion of said frame is supported on a rocking framecomprising a rock shaft 28 which is pivoted on a bracket 29 carried bythe segment 9. Rising from the shaft 28 are three upright arms, the twoend arms being pivot ally connected to and supporting the arms 24;

' holder l by the slotted forward end portion of a link or connector 32,said link extending rearward to transmit movement between the universalbar frame and the escapenient devices hereinafter described.

A space bar or key 33 of ordinary construction is arranged at the frontside of the keyboard composed of the banks of printingkeys 20. Saidspace bar is supported on the front ends of arms 34 which projectforward from a rock shaft 35 mounted in the base 1; Secured to said rockshaft at about its middle and projecting upward and rearward therefromis an arm 36 which carries an arm or extension 37. Said arm 37 isadjustably supported on the arm 36, being pivoted at 38 to said arm 36and the two arms being held in adjusted relationships by a clampingscrew 39 which passes through a slot 40 in the arm 37. Said arm 37 has aslot ll that is engaged by an eccentric screw 4-2 carried by the arm 36.When the screw 39 is loosened the screw 12 may be turned to readjust thearm 37 so as to change the normal position of a lateral pin 43 which iscarried at the upper end of the arm 37 as an engaging device or motiontransmitter, as hereinafter explained. Connected to the arm 37 is theupper end of a coiled draw spring 4A. the lower end of said spring beinghooked or anchored to a projection 45 that is in the form of an angularstrip secured as by a rivet 4:6 to a transversely extending piece ofsheet metal that is folded into a Cshape and provides a clamp or holderl7 for a felt damper 4L8 (Fig. 1). The felt strip composing: the damperis folded lengthwise so as to fit inside the holder 47 and hasprojecting; end portions 49 that are turned at right angles upward anddownward to provide a contact surface for the restoring spring-s o0 ofthe key levers 18. The lower ends of the springs 50 are connected totheir respective key levers and the upper end portions are connected toadjusting screws 51 rotatively supported in and projecting downwardthrough a hood 52 extending transversely of the key levers and securedto the sides of the base 1. The til-shaped holder 4-? is sup ported fromthe hood 52 by a pair of spring; clips 53 that are hooked over the hoodnear its ends, said clips, terminating: at their front one s inii-shaped portions which embrace and clamp the end portions of the 7.The upper end portion of the snip l5 abuts the under side f the hood 52,said strip thus being held against displacement. When the key levers areactuated the springs 50 tend to vibrate some what, this vibrationresulting in a humming, or, as it is termed, chiming sound. The feltcontact faces 49 bear lightly against the fronts of the springs so. asnot to interfere with their operation, but at the same time serve as adamper to reduce their vibration and eliminate the sound due thereto.

Carried by a frame 55 pivotedat 56 on the travelling platen carriage isa feed rack 57 that is normally maintained in springpressed engagementwith a feed pinion 58 which is integral with a horizontal rearwardlyextending sleeve 59, as best shown in Fig. 8. Passing through saidsleeve is a shaft 60 provided with enlarged bearing faces 61. Theextreme end portions of the shaft are reduced as indicated at 62 and 68and bear in the front and rear end portions or ears 6 1 and 65 of abracket that comprises a yoke portion 66 horizontally disposed andterminating in the said bearing portions 64 and 65. The rear end portion68 of said shaft bears directly in a bushing 63 whichis adjustablyclamped in the ear 65. Integral with the yoke portion 66 is a foot piece67 that receives screws 68 whereby the bracket 64.67 is detachablysecured to a lower bracket designated as a whole by the numeral 69. Saidbracket 69 preferably formed of a single piece of sheet metal isdisposed in a cut-out 70 in the rear portion of the top plate 2, thebracket 69 being detachably fixed to said top plate by screws 71. Thetwo brackets support the duplex escapement devices comprised in both ofthe escapeinent mechanisms and may be detached. together with saidescapement devices by removing the screws 71.

Referring rst to the escapement mechanism that is operative by theprinting keys, said. mechanism comprises two escapement wheels 72 and 73having a common axis of rotation. The wheel 72 is formed with 'ad-ialteeth 74 beveled at the rear to provide contact or working faces 75.Said wheel further comprises a hub portion 76 and bosses 77 and 78, asbest shown in Fig. 8. The hub 76 receives screws 79 that are threadedtherethrough and abut against flattened faces on the shaft 60, thussecuring the wheel 7 2 fixedly to said shaft. The wheel 73 formed with acircular cut-out 80 to fit over the boss 78 and bear rotatively on theperiphery thereof. Said wheel is of substantially the same diameter asthe wheel 72 and is likewise provided with radial teeth 81 correspondingin number to the teeth aand having bevels 82 at their front sides. Thewheel 73 is movably related to the wheel 72, being provided with arcuateslots 83 preferably three in number, best shown in F g. 7. These slotsreceive headed screws 84- whieh are threaded into the wheel 72. A wirespring 85 is wound around the boss 77 for nearly its whole periphery.said on the rocker.-

spring being confined between the two wheels and having one of its endsconnected to one wheel and the other to the other wheel. Viewed from therear the spring 85 tends constantly to turn the wheel 73 in clockwisedirection. The relative movement thus provided for between the twoescapement wheels is sufficient to afford substantially aletter spacefeeding movement of the carriage. Pivoted on the front of the escapementwheel 72 is a spring-pressed pawl 86 which cooperates with ratchet teeth87 formed interiorly of a box or drum 88 integral with the sleeve 59.The pawl-andratchet connection 86, 87 thus provided between the pinion58 and the escapement wheels 7 2 and 73 permits return movements of thecarriage independently of said escapementwheels.

The dog device that cooperates with the escapement wheels 72 and 78 toafford escapement movements under the control of the printing keys ismounted on a vibratory carrier or rocker designated as a whole by thenumeral 89. Said rocker is preferably made of sheet metal and hasrearwardly turned ears 90 which are formed with bearing depressions thatreceive the inner coned ends of pivot .screws 91 that are adjustablysecured in ears 92 and 93 bent off rearward from the sides of thebracket 69. The rocker 89, 90 carries at its upper end portion above itspivotal axis a headed shoulder screw 94 that is threaded throughtherocker 89 and is secured thereto by a nut 95 abutting against thefront face of said rocker. A washer 96 is interposed between theshouldered portion of the screw and the rear face of the rocker and whenthe nut 95 is tightened cooperates to clamp the screw 94 in place. Theshouldered portion 941 of said screw 94 provides a bearing surface for adouble hub member as will be clearly understood from Fig. 8. Said hubmember comprises hub portions 97 divided by a centrally disposed flange98. Mounted on the hub at opposite sides of the flange are wheels 99 and100 formed with radial teeth 101 and 102, there being preferably tenteeth on each wheel. The wheels and their hub 97 98 are secured in fixedre lationship by pins or stakes 108. As will hereinafter clearly appear,the teeth 101 of the rear wheel are adapted each to function as anescapement dog or pawl in coo aeration with the escapement wheels 79 and8. The rocker 89 has secured to its left-hand side (viewed from therear) an arm 104, the upper end of said arm being pivoted on a screw 105which is threaded into an ear 106 Between its ends ti e arm 10% receivesan adjusting screw 107 which cooperates with a nut 108 to vary theivotal position of said arm 104 when its pivot screw 105 is loosened.The purposeof this construction is to vary the normal position of alaterally projecting pin 109 carried at the lower end of the arm 10a.Said pin is formed with a groove 110 which receives the forked rear endof the connector or link 32. Real-ward movement transmittedto the linkfrom the universal bar 22 is in turn transmitted through the pin 109 andarm 101 to initiate a vibratory movement of the rocker 89 and the partsmounted thereon about the pivotal axis passing through the pivots 91.The rocker 89 is provided with a restoring spring 111, the rear end ofwhich is hooked through a hole in said rocker below its pivotal axis,the forward end of spring being anchored to the perforated head of a rodor pin 112, said rod being secured for fore and aft adjustment by ascrew pin 113 to the ear 92 ot' the bracket 69. The screw pin is clampedinto place by a nut 11% that abuts'against the outer face of the ear 92.The rod 112 and the spring 111 pass througl'i a suitable hole in thewall of the bracket 69. The spring 111 tends constantly to maintain a.stop pin 115 carried by and projecting forward through the rocker 89below its axis in contact with the bracket 69 as shown in Fig. 1. Bythis arrangement one of the teeth 101 may be brought substantially intothe plane of rotation of the wheel 73, the lower tooth 81 of said wheelbeing engaged by the upper tooth 101 of the wheel 99. A stop pin 116,carried by the rocker 89 above its pivotal axis, limits the forwardvibratory swing of the rocker under impulses of the printing keys. Atsuch times the wheel 99 pre rented from rotating on its own axis bycooperation of the wheel. 100 with devices hereinafter described, and asa consequence the uppermost wheel tooth 101 will swing into and out ofcooperation with the escapement wheels 72 and 73 at each vibration ofthe dog rocker 89, thus attording letter space feeding movements of thecarriage. In this connection it will be understood that the normalrelationship of the parts is as shown in Figs. 1 and 7 with the wheeltooth 101 acting as adog and in engagement with the lowermost tooth 81ot' the rear escapementwheel 73 when one of the printing keys isactuated, causingthe connected type bar to print, said type bar as itswings upward and rearward will act through its contact'tace T1 toactuate the universal bar 22 and cause the connector 32 to move rearwad, swingliw the rocker 89 on its pivotal center and cansing the engagedtooth 101 of the wheel dog 99 to swing forward out of engagement withthe tooth 81 and into engageme t with the lowermost tooth 7 1 of thefront escapement wheel 72 illustrated in Fig. 2. As soon as the tooth 81is released by the wheel the spring 85 will rotate the wheel 73relatively to the wheel 72 until said wheel '13 is arrested by theengagement of the ends of the slots 83 with the shanks ot the screws 81.

There is a slight drop between the teeth of the wheels 73 and 72 so thatthe carriage receives an initial movementon the down stroke of aprinting key. However, the actual letter space movement of the carriagedoes not occur until the return movement of the dog rocker 89 takesplace. Such carriage movement starts as soon as the wheel dog starts toswing rearward, due to the beveled contact face 7 5. As soon as thetooth 101 of the wheel dog clears said contact face the wheel 73 willturn to an extent permitted by the length of the slots 83, suchmovement, of course, being opposition to the spring 85 which willthereby be contracted, the result being that the relationship of the twowheels is restored to the normal position shown in 7. As a result ofthis operation of the escapement mechanism the power driven carriage,which is connected therewith through the rack and pinion connection 57,58, will be afforded a letter space movement towards the left under theimpulse of the usual main spring or carriage motor mechanism which isconventionally illustrated in Fig. 1, the main spring drum beingdesignated as 3 and the band or strap that connects it to the carriageas3 ment devices are so related that the substantially completeescapelnent movement takes place during the initial stage of the returnmovement of the printing type bar away from the platen.

Referring now to the second escapement mechanism comprised in the duplexescapen'ient devices and which is actuated from tl e space bar of themachine, said mechanism comprises the wheel 100 which serves as an.escapement wheel proper in cooperation with a pair of escapement dogshereinafter described. The escapement mechanism thus constituted isconnected with the carriage through the wheel 99 and the wheel 73 whichserve in etlect as gear wheels during escapement operations underactuation of said space bar. The dog devices with which the escapementwheel 100 cooperates are mounted on a dog carrier or rocker, designatedas a whole by the numeral 117, and provid d with a cross portion 118which is depressed at its ends to receive screw pivots 119 that areadjustably secured in ears 120 projecting from the lower portion of thebracket 69. The rocker 117118 carries a holding dog 121 and a. steppingdog 122 of ordinary construct-ion. The dog 121 is in the form of a platehaving an engaging tooth and is adjustably secured by screws 123 to therocker 117 at its rear face and above its pivotal axis, The dog 122 isin the form of a pawl having a hub portion 12 1 which receives a bearingpin 125 pivotally supporting the pawl at the front face 01? the rocker117. The dog or pawl 122, 12 1 has a tail portion 126 which is connectedThe escapeto a dog spring 127 anchored to a screw stop pin 128 on therocker, said spring tending constantly to throw the upper end of the dog122 leftward when viewed from the rear. Normally the dog 121 is engagedwith the lowermost tooth of the Wheel 100, the rocker being held innormal position to maintain this engagement by reason of the contact ofthe stop pin 128 with the face of the bracket 69 through the action of arocker spring 129. Said spring, as best known in Fig. 8, is coiledaround a pin 130 on the bracket 69, its rear end portion being coiledaround a screw pin 131 on the lower end portion of the rocker 117.

The rocker 117 is actuated or vibrated from the space bar 33 throughimpulses communicated from the actuating pin 43 (Fig. 1) to an actuator132 that is pivoted at 133 to an ear 134 turned rearward from the lowerend portion of the bracket 69. The downwardly extending arm of saidactuator 132 is slotted as indicated at 135 to fit over and engage withthe actuating pin 43. The actuator 132 has an upward extension 136 atthe front of the bracket 69 terminating in a rearwardly bent nose orcontact portion 136 which passes through an opening in the bracket andis adapted to contact with the front face of rocker 117 above itspivotal axis.

It will be understood that when the parts are in normal position the dog121 will be engaged with the wheel 100 at its under side while the dog122 will lie forward of the plane of said wheel. When the space bar 33is actuated it rocks the shaft 35 and swings the pin 43 upward andforward about said shaft, the motion of said pin being transmittedthrough the nose 136 to the rocker 117. The rocker 117 is thereby swungrearward from the normal position shown in Figs. 1 and 8, causing thedog 121 to disengage from the lowermost tooth 102 of the wheel 100 andbringing the-stepping dog 122 into the plane of said wheel. As soon assaid wheel is released by the dog 121 it will start to turn incounter-clockwise direction (as viewed in Fig. 7) so that the oncomingwheel tooth 102 will engage with the dog 122, turning said dog on itspivot and extending its spring 127 until said dog is arrested by itsstop 137. The parts will now be related as shown in Fig. 6. Thisoperation which takes place during the depression of the space barpermits the wheel 100 to turn one tooth. The connected wheel 99simultaneously turns, of course, to a corresponding extent, this motionbeing in turn transmitted or afforded to the connected wheel 73 andthence through the rack and pinion 57, 58 to the power-driven carriagewhich will be drawn a letter space distance leftward under the pull ofthe carriage motor 3*.- On releasing the space key the parts will berestored to normal position by the restoring springs, It will beunderstood that at each depression of the space key the operation aboveoutlined will be repeated, the second escapement mechanism operating asa reverse feed escapement and the elements 73 and 99 of the otherescapement mechanism acting as transmitting devices or gear wheelsbetween the carriage and said second escapement mechanism. It will bealso apparent that the first described escapement mechanism operates asan ordinary feed escapement, the escape- 100 on the rocker 89 being soslight becauseof the arrangement of the parts that contact will not belost between the tooth 102 and the dog 121 at any time. The onlytimethis relationship is disturbed is when the space bar is actuated, whichreleases both wheels 99 and 100. Thus the wheel dog 99 acts on theescapement wheel 73 to afford escapement movements in two ways, i, e.,by a bodily movement and also by a rotary movement.

Preferably there is provided a combined stop and actuating member whichcooperates with certain of the escapement devices and also with anescapement-wheel dog or wiper detent mechanism substantiallycorresponding with the mechanism disclosed in the patent to Seib No.1,342,466 dated June 8, 1920. In Figs. 1, 7 and 8 there is fragmentarilyillustrated a dog stop or wiper det'ent 138 coresponding to the member25, 36 disclosed in the aforesaid Seib patent. Cooperative with the stopmember 138 there is preferably provided in the present ill. stance amember designated as a whole by the numeral 139, said member being madeof a single piece of sheet metal and bent to the desired shape asillustrated in Figs 1, 7 and 8. Said member comprising a cross portion140 having rearwardly bent ears 141 which are perforated to fit over andbear rotatively on the pivots 91 between the ears 92 and 93 of thebracket 69. An arm 142 projects upward from the right-hand end portion,viewed from the rear, of the cross part 140 and is offset rearward sothat its upper end portion is adapted for. coperation with the member138. The arm 142 is in register with the stop pin 116 which is adaptedto cooperate with it, said stop pin normally contacting with said armwhich acts as an abutment to determine the normal position of the dogrocker 89. Extending downward from the cross portion 1 10 at the rightis an arm or extension 1 13 which carries a stop pin 1 14c adapted forcooperation with the dog rocker 11'? and to arrest said dog rocker whenit is actuated so to determine the limit of its movement. When thecarriage is returned, as is well understood, the stop 138, which isspring pressed and which normally lies out of the plane of the wheel 72,will be thrown into the plane of said wheel and will interlock with theteeth thereof, this action being due to the release of the stop 138 bythe carriage rack by which said stop member is normally controlled.After the carriage has been fully restored to the right, an actuation ofa printing key will automatically throw the stop 138 out of its lockingposition, due to the action of the pin 116 on the arm 1 12 which in turnwill swing the stop 138 out of use. Likewise an operation of the spacebar at the beginning of a line instead of a printing key will actuatethe dog rocker 11? which through the pin 144; will correspondingly swingthe memher 139 on its pivots, causing the extension 142 to throw out themember 138.

It will be understood that during the normal operation of the machinethe two escapement mechanisms operate independently of each other.During actuations of the printing keys the first or ordinary escapementmechanism will be operated to afiord letter space movements of thecarriage after the type bars have printed and shortly after their returnmovements away from the platen have started. During these operations thesecond escapement will remain substantially unaffected. This will beclear from a consideration of Figs. 1, 2, 5 and 5 In Figs. 1 and 2,showing the normal relationship of parts, the dog or tooth 101 engageswith one of the teeth 81, whereas in Figs. 2 and 5 the dog tooth 101 isshown in its abnormal position engaged with the beveled or working faceof the tooth 7 1, this tooth 101 being prevented from rotating about theaxis of its wheel by the engagement of a tooth 102 with the dog 121.During the return movement the dog 101 will still be prevented fromturning and when it has engaged with a tooth 81 and has cleared thetooth 74; the full escapement movement will take place.

On the other hand, when the space key is actuated an escapement movementof the carriage will be afforded during the depression of said key byreason of the second or reverse feed escapement. The normal relationshipof the parts is as shown in Figs. 1 and 6 while their relationship whenthe space key is fully depressed is shown in Figs.

3 and 6 Normally it will be noted the tooth or dog 121' is engaged witha wheel tooth 102 while the dog 122 stands forward of said tooth. As aresult, however, of depressing the space key the dog 121 is carried outof engagement with the tooth 102 and the dog 1.22 is brought intoposition to be engaged by the oncoming tooth 102 afford-- ing a feedingmovement of the carriage.

The construction is such that the two escapement mechanisms however theymay be operated will always each afford a stepping movement of thecarriage. This is true no matter how irregular the operations may be.For example, in Fig. 4 is illustra'tcd the relationship of the parts ofboth escapement mechanisms when both a printing key and aspace key arein depressed positions. The parts are positioned to afford an escapementmovement following the movement which the carriage will receive when theupper rocker, that of the first escapement mechanism, has retracted farenough for the dog tooth 101 to clear the engaged tooth 74: and enterthe plane of the tooth 81. As soon as this takes place the feedingmovement due to the printing key actuation will take place as though thespace bar were not depressed. Also the movement due to the actuation ofthe space bar will occur. No matter in what order the printing key andspace bar may be actuated and released there will result a feedingmovement for the last printed letter and also a feeding movement for thespace following it.

Various changes may be made without departing from my invention.

What I claim as new and desire to secure by Letters Patent, is

1. Escapement devices for the power driven carriage of a typewritingmachine comprising two complete escapement mechanisms, one of saidmechanisms comprising two escapement wheels and a single cooperating dogand the other comprising a single escapement wheel and a pair ofcooperating dogs, said single dog and said single wheel having a commonmovable support.

2. Escapement devices for the power driven carriage of a typewritingmachine comprising two complete escapement mechanisms adapted forseparate operations, one of said mechanisms comprising two escapementwheels and a single cooperating dog and the other of said mechanismscomprising a single escapement wheel and a pair of cooperating dogs,said single dog and said single wheel having a common movable support,the first of said mechanisms affording a feeding movement of thecarriage dur ing the return of the parts to normal position and thesecond of said mechanisms aifording a feeding movement of the carriageduring the depression of a key.

3. Escapement devices for the power driven carriage of a typewritingmachine comprising two complete escapement mechanisms, one of saidmechanisms comprising two escapement wheels and a single coopcrating dogand the other of said mechanisms comprising a single escapement wheeland a pair of cooperating dogs, saio single dog and said single wheelhaving a common movable support, the first of said mechanisms beingoperative by the printing keys, the second mechanism being operativeonly by the space bar of the machine.

'4. Escapenient devices for the power driven carriage of a typewritingmachine comprising two separately operative escapement mechanisms, oneof said mechanisms comprising a wheel dog and escapement wheels withwhich said dog cooperates, said dog being held against rotation by theother escapement mechanism.

5. Duplex escapement mechanism for typewriting machines comprising twopairs of toothed wheels, the wheels comprised in each pair having acommon of rotation, the two axes of rotation being horizontally disposedand parallel with each other, and means for affording bodily movement ofone pair of wheels so as to cause one member of said pair to cooperatewith the other pair of wheels to afford escapement movements of thecarriage.

6. Duplex escapement mechanism for a typewriting machine comprising twopairs of toothed wheels,-one of said pairs only being rotatable duringthe operation of the printing keys, and means for bodily moving theother pair to cause one of its wheels to cooperate with the rotatablepair to afford escapement movements of the carriage when the printingkeys are actuated, all of the wheels being rotatable when the space barof the machine is actuated.

7. Escapement devices for the powerdriven carria e of a typewritingmachine comprising two escapement mechanisms which include two keyoperated dog rockers, a pair of toothed wheels rotatably mounted on oneof said dog rockers, escapement wheels with which one of said pair oftoothed wheels cooperates when said rocker is actuated, and two dogs,one a stepping dog and the other a holding dog, mounted on the other ofsaid dog rockers and cooperative with one of said toothed Wheels whensaid rocker is actuated.

8. Escapement devices for the powerdriven carriage of a typewritingmachine comprising two escapement mechanisms which include two dogrockers, a pair of toothed wheels rotatably mounted on one of said dogrockers and two dogs, a stepping dog and a holding dog, mounted on theother of said dog rockers, said dogs being adapted when their rocker isvibrated to codriven carriage of a typewriting machine comprising twoescapement. mechanisms w 11 include two dog rockers or carriers,

a pair of toothed wheels rotatably mounted on one said dog rockers andtwo dogs, a stepping dog and a holding dog, both mounted on the other ofsaid dog rockers, said last named rocker being actuated by the space baronly of the machine, whereby said dogs are caused to coa ct with one ofsaid toothed wheels to afford letter space move ments of the carriage.

l0. Escapement devices for the powerdriven carriage of a typewritingmachine comprising two escapement mechanisms which include two dogrockers or carriers, a pair of toothed wheels rotatably mounted on oneof said dog rockers and two dogs, a stepping dog and a holding dog bothmounted on the other of said dog rockers, said last named rocker beingactuated by the'space bar only of the machine, whereby said dogs arecaused to coact with one of said toothed wheels to afford letter spacemovements of the carriage, the other of said wheels at such timeailording an operative connection between the first toothed wheel andsaid power-driven carriage.

11. In a typewriting machine, the combination with a power drivencarriage, of escapement devices including a wheel dog, and keysoperative on said dog, certain only of said keys causing a bodilymovement of said dog to afford letter feed movements of said carriage,certain other of said keys affording only rotary movements of said dogduring letter spacing operations.

12. In a typewriting machine, the combination of a traveling carriage, afeed rack thereon, a cooperating feed pinion, a pair of toothedescapement wheels connected to said. pinion, said wheels being adaptedfor relative movement with respect to each other, a second pair oftoothed wheels, a rocker on which said second pair of wheels llf:

are mounted, said rocker being operative by the printing keys, one ofsaid second pair of wheels coacting with said first named pair of wheelsto afford letter space movements of the carriage, a second rockeroperatively connected with the space bar of the machine, and a pair ofdogs on said second rocker, said dogs enacting with one of said secondpair of wheels to afford letter space movements of the carriage when thespace bar is actuated.

13. In a typewriting machine, the combination of a carriage; duplexescapement cleliil's vices including a plurality of escapement Wheelsand tWo key actuated rockers; means for locking certain of said Wheelsagainst rotation during return movements of the carriage; and a pivoteddevice operative by both of said rockers to release said locking meansand free the escapement Wheels for letter feed movements.

14. In a typewriting machine, the combination of a carriage; duplexescapement devices including a plurality of escapement Wheels and twokey actuated rockers; means for locking certain of said Wheels againstrotation during return movements of the carriage; anda pivoted deviceoperative by both of said rockers to release said locking means, saidpivoted device also serving as a stop for both of said dog rockers.

an intermittent stepby-step feed movementof the carriage.

Signed at the borough of Manhattan, city of New York, in the county ofNew York and State of New York this 30th dayof December, A. D. 1926.

EDWIN E. BARNEY.

